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1 Dorsal fins are found on the back of the fish. 2  There may be up to three of them. 3  The fish uses this fin for balance in the water and sudden movements. 4  Caudal fins are also known as tail fins.5  This is what we refer to as the fish's tail. 6  Anal fins are on the ventral (bottom) surface of the fish, behind the anus. Dorsal fins are found on the back of the fish. 2  There may be up to three of them. 3  The fish uses this fin for balance in the water and sudden movements. 4  Caudal fins are also known as tail fins.
Description & Behavior. Atlantic bluefin tuna, Thunnus thynnus (Linnaeus, 1758), aka blue fin tuna, blue-fin tunny, bluefin tuna, horse mackerels, northern bluefin tuna, and squid hounds..., are regarded as one of the most highly evolved fish species and one of the most prized fish in danger of overfishing.tlantic bluefin tuna are the largest member of the Scombridae Family (albacores, bonitos, mackerels, tunas). They are one of the largest bony fishes and can reach lengths of up to 3 m, although they are more commonly found from 0.5- 2 m in length.